Pseudoscalar decay constants fₖ/fπ, fD and fDₛ with Nf = 2 + 1 + 1 ETMC configurations
Dimopoulos, P. · Frezzotti, R. · Lami, P. · Lubicz, V. · Picca, E. · Riggio, L. · Rossi, G. C. · Sanfilippo, F. · Simula, S. · Tarantino, C.
Original · EN
We present a lattice QCD calculation of the pseudoscalar decay constants fₖ, fD and fDₛ performed by the European Twisted Mass Collaboration with Nf = 2 + 1 + 1 dynamical fermions. We simulated at three different values of the lattice spacing, the smallest being approximately 0.06fm, and with pion masses as small as 210MeV. Our main results are: fₖ₊/fπ₊=1.183(17), fₖ₊=154.4(2.1)MeV, fDₛ=242.1(8.3)MeV, fD=201.9(8.0)MeV, fDₛ/fD=1.199(25) and (fDₛ/fD) / (fₖ/fπ) = 1.005(15).
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